well the feeding might be the screws in the mag the top ones by the feeding, the really small ones. if they are torked down really hard you will have feeding problems. trust me i had the same problem. as for the hopup i think they are vsr from what everybody else says i have not gotton to take one appart yet
but try looking on evike, if it is vsr style you can get a normal one again, upgrade it to a hopup that takes aeg barrels. or you can try buying a firefly bucking!! they are really good and should help. also what is the problem with the hopup?????? it might be a easy fix, so you dont have to spend money